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vuln-cve/data/2026/64xxx/CVE-2026-64538.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-64538",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-07-19T15:36:31.795Z",
"datePublished": "2026-07-27T20:10:32.779Z",
"dateUpdated": "2026-11-10T12:49:27.750Z"
},
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"shortName": "Linux",
"dateUpdated": "2026-08-17T04:57:14.474Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: Fix null-ptr-deref in fib6_nh_mtu_change().\n\nfib6_nh_mtu_change() re-fetches idev via __in6_dev_get(arg->dev) and\ndereferences idev->cnf.mtu6 without a NULL check. addrconf_ifdown()\nclears dev->ip6_ptr with RCU_INIT_POINTER() after rt6_disable_ip() has\nreleased tb6_lock, so the RA-driven MTU walk can observe a NULL idev and\noops. The caller rt6_mtu_change_route() guards its own __in6_dev_get(),\nbut this re-fetch is unguarded; nexthop-backed routes survive\naddrconf_ifdown()'s flush, so the walk still reaches it after ip6_ptr is\nnulled.\n\nReturn 0 when idev is NULL, matching rt6_mtu_change_route() and the\nfib6_mtu() fix in commit 5ad509c1fdad (\"ipv6: Fix null-ptr-deref in\nfib6_mtu().\").\n\n Oops: general protection fault, ... KASAN: null-ptr-deref in range\n [0x00000000000002a8-0x00000000000002af]\n RIP: 0010:fib6_nh_mtu_change+0x203/0x990\n rt6_mtu_change_route+0x141/0x1d0\n __fib6_clean_all+0xd0/0x160\n rt6_mtu_change+0xb4/0x100\n ndisc_router_discovery+0x24b5/0x2cb0\n icmpv6_rcv+0x12e9/0x1710\n ipv6_rcv+0x39b/0x410"
}
],
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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],
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"status": "affected",
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"status": "affected",
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"status": "affected",
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},
{
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"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
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],
"versions": [
{
"version": "5.3",
"status": "affected"
},
{
"version": "0",
"lessThan": "5.3",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.261",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
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},
{
"version": "5.15.212",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
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},
{
"version": "6.1.178",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
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{
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"lessThanOrEqual": "6.6.*",
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},
{
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"lessThanOrEqual": "6.18.*",
"status": "unaffected",
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{
"version": "7.1.5",
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"status": "unaffected",
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{
"version": "7.2",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.3",
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},
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"references": [
{
"url": "https://git.kernel.org/stable/c/d08d019f2f43a6f9a71e81868bbc326b3afaf37b"
},
{
"url": "https://git.kernel.org/stable/c/1451deca9896957159f0666520a792c1b861af4f"
},
{
"url": "https://git.kernel.org/stable/c/b2c70dd3326809429b709a9c7e9220d29923051a"
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{
"url": "https://git.kernel.org/stable/c/302d57ed7872838b40e56a868fb4c7da7da606e9"
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{
"url": "https://git.kernel.org/stable/c/80600b5d0f3ecb9324120dc95b5e915130f516c5"
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{
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},
{
"url": "https://git.kernel.org/stable/c/6428634f7a0b7878144b4925c37856bef3224967"
},
{
"url": "https://git.kernel.org/stable/c/46c3b8191aad3d032776bf3bebf03efdf5f4b905"
}
],
"title": "ipv6: Fix null-ptr-deref in fib6_nh_mtu_change().",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
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"providerMetadata": {
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"shortName": "siemens-SADP",
"dateUpdated": "2026-11-10T12:49:27.750Z"
},
"affected": [
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"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)",
"versions": [
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{
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{
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}
],
"version": "2.0.3",
"timestamp": "2026-11-06T16:41:04.434492Z"
}
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],
"title": "CISA ADP Vulnrichment",
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}
}
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